Lectures, 373 



facts brought forward to illustrate the theory, which shpw 

 that a body having its natural state of electricity reversed, 

 will become capable of attracting another which previously 

 it repelled. 



" If, by inserting the above observations in your Maga- 

 zine, you should cause them to be either confuted or con- 

 firmed, you will much oblige your humble servant, 



Dec. 24, 1808. "AUDITOR,*? 



LECTURES. 



Mr. Sowerby's Lecture on Chromalometry . — On the 12th 

 and lyth of December, Mr. Sowerby, author of British 

 Mineralogy, &c, delivered his long promised Lecture on 

 Chromatometry, at his house in Mead-Place, near the Asy- 

 lum. This Lecture, the object of which is to point cut a new 

 and very ingenious mode of ascertaining the arrangement, 

 mixture, and ' measure of prismatic tints, and to show 

 their correspondence with material colours, was accom- 

 panied by an exhibition, in which the prismatic tints were 

 oduced, as from the sun, moon, and stars, the sun as seen 

 i the different planets, and a productor, 60 feet long, 

 g an infinite series : also the material and prismatic 

 tines forming mixtures in union, with the effect as from can- 

 dles, a .: flamheaus, and a sort of prismatic illumination, 

 ■with different lustres, from metals, &c. The whole was 

 elucidated with apparatus of a new and original kind, which 

 promises to assist the philosopher in very much extending 

 our knowledge on this subject. — Mr. Sowerby continues to 

 yepeat the Lecture every Monday, and has announced a work 

 illustrative of his discoveries. 



Theatre of Anatomy . — Mr. Taunton will commence his 

 Spring Course of Lectures on Anatomy, Physiology, Pa- 

 thology, and Surgery, on Saturday the 2 1st of January, 1809, 

 -at Eight o'Clock in the Evening. Jn the Course of these 

 Lectures Mr. Taunton will take a view of the Structure and 

 CEconomy of the Human Body, and describe the Causes, 

 -Symptoms, Nature, and Treatment of Surgical Diseases, with 

 the Mode of performing Operations. The Course will be 

 calculated to afford Anatomical and Physiological Instruction, 

 not only to the Medical Student, but to the Artist, or pri- 

 vate Gentleman. Particulars may be had on Application to 

 Mr. Taunton, Greville-Strcet, Hatton- Garden. 



London 



